MAGNETIC AND ELECTRICAL-PROPERTIES OF UPD3

We have measured the electrical resistivity, Hall coefficient, thermoe lectric power, magnetic susceptibility, magnetization, specific heat, magnetoresistance and de Haas-van Alphen (dHvA) oscillation of UPd3 to clarify the magnetic and Fermi surface properties. A phase transition , which occurs at about 4.5 K, is most likely related to the antiferro magnetic ordering because the magnetic specific heat shows a T3 depend ence below 2 K. About ten different dHvA branches ranging from 1.8 x 1 0(5) Oe to 7.5 x 10(7) Oe have been observed. From the angular depende nce of dHvA frequency, UPd3 is found to consist of the closed spherica l Fermi surfaces and multiply-connected ones. The cyclotron masses are light, ranging from 0.5 m0 to 3.6 m0, which indicate the localized f electron character.